Kinetics of inorganic nitrogen turnover in a sandy seepage face on a subterranean estuary

14 pages, 9 figures, 2 tables

Detalhes bibliográficos
Autores: Ibánhez, J. Severino P., Rocha, Carlos
Formato: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2017
País:España
Recursos:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/376538
Acesso em linha:http://hdl.handle.net/10261/376538
Access Level:acceso abierto
Palavra-chave:SGD
Seepage face
Nitrate reduction
Aerobic nitrate reduction
DNRA
Ria Formosa
id ES_5bea1a654b2cb8dead514386bea0cd92
oai_identifier_str oai:digital.csic.es:10261/376538
network_acronym_str ES
network_name_str España
repository_id_str
spelling Kinetics of inorganic nitrogen turnover in a sandy seepage face on a subterranean estuaryIbánhez, J. Severino P.Rocha, CarlosSGDSeepage faceNitrate reductionAerobic nitrate reductionDNRARia Formosa14 pages, 9 figures, 2 tablesSubterranean estuary seepage faces are recognized as important reactive interfaces that regulate solute transport to coastal ecosystems via Submarine Groundwater Discharge (SGD). Here we describe benthic processes and rates driving the biogeochemical regulation of SGD-borne inorganic N loading into the Ria Formosa lagoon (Iberian peninsula) through a sandy seepage face. Maximum potential NO3− reduction rates, obtained by kinetic modeling of advection-controlled flow-through reactor experiments, ranged from 2.33 ± 1.06 to 14.17 ± 0.22 nmol cm−3 “bulk” sediment (bs) h−1. Maximum potential nitrification ranged from 0 to 7.5 ± 1.3 nmol cm−3 bs h−1 while potential ammonium assimilation was valued at 2.0 ± 0.3 nmol cm−3 bs h−1. These NO3− reduction rates are in good agreement with previous estimates obtained by diagenetic modeling of in-situ porewater NO3− vertical profiles at the same location. Potential NO3− reduction rates were very sensitive to temperature (Q10 = 3.5 ± 0.2). Porewater velocity seems to control net NO3− reduction rates, probably by determining solute distribution but also its supply to the microbial community by shaping the diffusive boundary layer around sediment particles. Nevertheless, NO3− reduction rates seem ultimately limited by organic matter availability at high velocities. Half-saturation constants of NO3− for NO3− reduction were low, suggesting that the NO3− reducing microbial community had high affinity for NO3−. In addition, our experiments provide evidence for the occurrence of alternative NO3− reduction pathways, including Dissimilatory Nitrate Reduction to Ammonium (DNRA) and apparent aerobic NO3− reduction within the shallow subsurface sediment layer (2–12 cm depth)This study was funded by the Portuguese Foundation for Science and Technology (FCT), the EU (FEDER) and the Portuguese Government through grant contract SFRH/BD/39170/2007 (Fellowship to JSPI) and project NITROLINKS - “NITROgen loading into the Ria Formosa through Coastal Groundwater Discharge (CGD) - Pathways, turnover and LINKS between land and sea in the Coastal Zone” (PTDC/MAR/70247/2006)Peer reviewedElsevierFundação para a Ciência e a Tecnologia (Portugal)European Commission202520252017info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Postprintinfo:eu-repo/semantics/acceptedVersionhttp://hdl.handle.net/10261/376538reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttps://doi.org/10.1016/j.apgeochem.2017.10.015Noinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3765382026-05-22T06:33:51Z
dc.title.none.fl_str_mv Kinetics of inorganic nitrogen turnover in a sandy seepage face on a subterranean estuary
title Kinetics of inorganic nitrogen turnover in a sandy seepage face on a subterranean estuary
spellingShingle Kinetics of inorganic nitrogen turnover in a sandy seepage face on a subterranean estuary
Ibánhez, J. Severino P.
SGD
Seepage face
Nitrate reduction
Aerobic nitrate reduction
DNRA
Ria Formosa
title_short Kinetics of inorganic nitrogen turnover in a sandy seepage face on a subterranean estuary
title_full Kinetics of inorganic nitrogen turnover in a sandy seepage face on a subterranean estuary
title_fullStr Kinetics of inorganic nitrogen turnover in a sandy seepage face on a subterranean estuary
title_full_unstemmed Kinetics of inorganic nitrogen turnover in a sandy seepage face on a subterranean estuary
title_sort Kinetics of inorganic nitrogen turnover in a sandy seepage face on a subterranean estuary
dc.creator.none.fl_str_mv Ibánhez, J. Severino P.
Rocha, Carlos
author Ibánhez, J. Severino P.
author_facet Ibánhez, J. Severino P.
Rocha, Carlos
author_role author
author2 Rocha, Carlos
author2_role author
dc.contributor.none.fl_str_mv Fundação para a Ciência e a Tecnologia (Portugal)
European Commission
dc.subject.none.fl_str_mv SGD
Seepage face
Nitrate reduction
Aerobic nitrate reduction
DNRA
Ria Formosa
topic SGD
Seepage face
Nitrate reduction
Aerobic nitrate reduction
DNRA
Ria Formosa
description 14 pages, 9 figures, 2 tables
publishDate 2017
dc.date.none.fl_str_mv 2017
2025
2025
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Postprint
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/376538
url http://hdl.handle.net/10261/376538
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv https://doi.org/10.1016/j.apgeochem.2017.10.015
No
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869408849579999232
score 15,812455

Registos relacionados